This is common with Harley's horns. There is a screw on the backside of the horn. Turn this screw in very small increments until the horn starts sounding again. If it never does, you need a new one. Make sure you check the ground on the horn.

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If it is a double seat all you do is unscrew the screw at the back of the seat that goes into the rear fender. Then push the whole seat forward and lift to disengage the seat from the horn post (for lack of what they actually call it) and then pull back away form the take to free the tang that fits under the seat.

Hi Anonymous, first check the wire connections to the horn making sure they are clean and tight, there is power going to it and the ground wire is securely fastened. Then look behind the horn body for a small set screw sometimes with a jam nut. This screw puts tension on the horn diaphram to vibrate alot or vibrate a little. Have someone hold in the horn button while you adjust the screw in or out as necessary. Good luck.